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T; P. HARDY.

STEAM RADIATOR. No. 339,696. Patented Nov 17 1885.

T'Lfix! W Y? S a *3] n 0 L WITNESSES: INVENTOR m I Thom a: P. H WYCL'B az 7Z4Wv( .B BY MW Wad/f ATTORNEYS UNITED STATES PATENT OFFICE.

THOMAS P. HARDY, oENEw YORK, N. Y.

STEAM- RADIATOR.

SPECIFICATION forming part of Letters Patent No. 330,696, dated November17, 1885. Application filed January 15, 1885. Serial No. 152,989. (Nomodel.)

To aZZ whom it may concern:

Be it known that I, THOMAS P. HARDY, a

' citizen of the United States, residing at New a specification.

The object of this invention is to apply a diaphragm to a radiator-tube,the body of which has a larger diameter than its foot, and also toincrease the radiating-surface of the tube.

The object of my invention I accomplish in the manner and by the meanshereinafter described and claimed, reference being made to theaccompanying drawings, in which- Figure 1 represents a horizontalsection in the plane m m, Fig. 2. Fig. 2 is a vertical section in theplane 3 Fig. 1.

Similar letters indicate corresponding parts.

In the drawings, the letter A designates the body of a radiator-tube,which is provided with a foot, B, threaded on its outer surface,

so that the tube can be secured in the base 0. The inside diameter ofthe foot B is smaller than that of the body A, so as toincrease theradiating-surface of the tube, and on the inner surface of the body Aare formed or secured grooved projections a a, diametrically opposite toeach other, as shown in Fig. 1. These projections extend inward slightlybeyond the inner surface of the foot B, and they are intended to receiveand retain the diaphragm D. This diaphragm must be introduced throughthe foot B, there being no other passage leading into the body A, and,since the inside diameter of the foot is smaller than that of the bodyA, it will be readily seen that the diaphragm, after having been pushedup into the body, would have no support if it were not for the groovedprojections a a. In pushing up the diaphragm care must be taken that theedges of the same enter the grooves of the projections.

The width of the diaphragm must be somewhat greater than the insidediameter of the foot B, and after said diaphragm has been pushed up intothe grooves of the projections it assumes the position shown in Fig. 1,and is retained by its own elasticity. In order to effect this retentionof the diaphragm by its own elasticity, it is necessary that thedistance between the grooves into which the diaphragm slides is lessthan the width of the diaphragm.

With the body A of my tube I have combined a series of lateral chambers,E, which open into the body of the tube and materially increase theradiating-surface of the same. The lateral chambers are so formed anddistributed that they do not interfere with the operation of screwingthe tubes into the base 0, even if said tubes are brought closetogether.

I do not claim as my invention a radiator tube provided with adiaphragm, such having been in use for many years, and is shown, forexample, in Patent No. 178,190.

What I claim as new, and desire to secure by Letters Patent, is-

The combination of a radiator-tube having the inside diameter of itsbody larger than that of its foot, and the body provided with groovedprojections extending inwardly beyond the inner surface of the foot, andslidable elastic diaphragm held in the grooved projections by itsinherent elasticity, the distance between the grooved projections beingless than the Width of the diaphragm, substantially as described.

In testimony whereof I have hereunto set my hand and seal in thepresence of two subscribing witnesses.

THOMAS P. HARDY.

Witnesses:

A. FABER DU FAUR, J r., E. F. KASTENHUBER.

